INFLUENCE OF THE PARAMETRIC GEAR MESH EXCITATION ON THE DYNAMIC BEHAVIOR OF A KINEMATIC CHAIN SUBMITTED TO TORQUE FLUCTUATIONS

抄録

Gear power transmissions are responsible for upsetting vibroacoustic phenomena. The gear teeth compliance, the manufacturing errors and the tooth corrections lead to a periodic transmission error fluctuation and a parametric excitation associated to gear mesh stiffness fluctuation. Under operating conditions, these excitation sources generate dynamic mesh forces transmitted to the housing and responsible for the whining noise radiated from the gearbox.
This work is focused on the multiphysics coupling between the gear mesh internal excitation and the external excitation associated with the upstream engine and downstream receiver system. These excitations mix the high frequencies of internal meshing excitations and low frequencies of the external excitations of the rotating shafts. The coupling between excitations generates an enrichment of the vibratory frequency response.
The goal of this paper is to present the spectral iterative methodology used and the dynamic results induced by this coupling in the case of a root vacuum pump.